End-piece-clamping means



June 2,1925. 1 I I w.- H. BOUTELLE END PIECE CLAMPING MEANS .Filed Nov. 14. 1925 I; ll J L 9 f 9 6 0 q LN a P/F/O/FART INVENTOR 016% Boufe/k;

'struction and is well adapted to the purposes Patented June 2, 1925.

WILLIAM H. BOUTELLE, OF SOUTHBRIDGE,

massacnosmrs, assIGNoaro AMERICAN OPTICAL COMPANY, or sou'rnnnznen, massa'cnosm'rs, A VOLUNTARY ASSOCIA- 'IION OF MASSACHUSETTS..

ama-rmca-cmrmo Ems.

Application filed November 14,.1a23. Serial No. 674,751.

To all whom it may concern:

Be it known that I, WILLIAM H. BoU- TELLE, a citizen of the United States, residing at Southbridge, in the county of Worcester and State of Massachusetts, have invented certain new and useful Improvements in End-Piece-Clamping Means, of which the following is a specification. j

The present invention relates to an 0 hthalmic mounting and has particular re erenoe to an 1 end-piece clamping means therefor. e 1

An important object of the'invention is to provide end-piece clamping meansthat will. securely clamp the said end-pieces in the desired position, said clamping means being so formed that it will be absolutely impossible .for the same to become accidentally displaced.

Another very important object of the invention is toprovide an end-piece clamping means of this nature that may be used to clamp the end-pieces in any desired adjustment, which adjustment will at all times be maintained until purposely moved.

Another very important object of the -invention is to provide an end-piece clamping means of this nature that will be strong,- durable, very simple and inexpensive in confor which it is designed.

Otherjobjects and advantages of the drawings will become apparent during the course of the'following description. In the drawings wherein like numerals are employed.t o ,des1gnate like parts throughout the same, f v

Figure '1 is a front elevation partly in section, of an ophthalmic mounting showing my invention in use, 1

Figure 2 is an enlarged elevation of my invention, 1

Figure 3-is a fragmentary sectional detail illustrating my invention before it has been put into adjusted position, and

Figure 4, which is a front elevation of an ophthalmic mounting partly in section for purposes of illustration, shows the prior art construction. 4 1

In the drawings, wherein for the purposes of illustration is'shown the referred embodiment of the invention, t e numeral 5 des' ates an ophthalmic eye-piece which carries at its ends the end-pieces 6 and 7 v .commodate the-tail piece I 14.

respectively,, between which is clamped the temple. 8, which is 'pivotally -mounted on the pin 9'. ,7 r In Figure 4 of'the drawings is'shown the prior art construction where n the end-pieces 6 and 7 are clamped together by means of the screw 10, which passes through aligned screw threaded apertures-formed in the endpieces 6 and 7 It will be noticed that the screw 10 is of the same diameter throughout its entire length. Through wear, the screw 10 has a tendency towork loose, thus allowing theiend-piecesfi and 7 to separate,after whichjthe len-swill be. free to a certain extent, tofbecome 1 displaced fro its original setting; [Especially in the case of lenses havrection of astigmatism,jit'is absolutely neces- 'ingacyljindr-ical power adapted forthecor- Y sa'ry thatthellens be at all times disposed 1 in its "initial-position .or its effective power.

will be 'lost; It will thus-b'e-seen that when the screw 10 has become slightly displaced and the lens moved, that a great inconvenience has been endured which cannot possibly be presentwhen the present invention isused.

In Figure 20f the drawings isfshown a largedetail of a form of screw used in connection with the'present invention'and comprises a head portion 11 which is provided 'with'a slot 12 to'allo'w its rotation. Formed integral with the head portion. 11 is a reduced body portion 13, while a reducedtail portion-14;preferablyyof the diameter of 'the body portion 13 is carried thereby. The

head portion 11 andthe' tail portion M are provided with screw threads,- the screw threadsof. the-head portion 11 being of a greaterv pitch than the screw thread of the tail "portion 14c. I have foundflthat 64 threads-per inch on the head .11 and threads per inch onthe tail piece 14 will be entirely satisfactory, but of course I dont wish to limit myself to these numbers.

'IVhen this form of screw is used the endpiece 6 will be provided with the screw threaded aperture 15', which will accommodate the threads of the head portion 11 while the endrpiecei'l' will be provided with the screw threaded aperture 16 adapted to ac- In use,"the screjwfwill be started shown in FigureB fthe drawings, by means of a .suitable'screw, driver or the like 17. Of

' clamping the.end-piecesl'fin-and V in Figure 1. The screw :m'a' be tightened 16; At the same time' 'tlie head pert-i011 1; 11'

will' beeome started infthe -ipertnre 115' and] upon 'rotetien of the. screw {driver 17 the screw may bev se'nt' -;heme; ,thliS .thorbughly to. any adjustment required, utin :view of the fact that theflteil-piece 1; end the heed portion 11: are rovided with. screw threads' of different pitches, 'it 'willbei utterly imr possible fonthe 'seidflserew"te work loose accidentally. 'lnjviewofthis fabtfit will be seen that a lensmey begilaoedinstheey r Piece 5' without fear oft otherwor' s, the screw will act as 'e'elemp- Itisto be understood that the fermbf my:

invention herewith shown and described is to be taken as the preferred embodiment of' the same and that variouschangespin'the shape,'sizeand armngementof parts may. be resorted t without departing "frem the v epirit" bf "in 9 er the the I the apertur 15am will start mim -P i Hevigv th s describe my 'ceim?" i i I I i A I 1 is h w $d6d d-pimand screw threaded tail; 7 e Eieewrriedtherebflthe said threads of the I e lens-working oose and causingbad effects tojthe eyq by incorrect ositi oning of the said", len's'wg'L'In aligned apertures- Icharecter" described comprising .a serewf threaded heed-piece, a 'screw threaded tail Pi ce, the-Vsc'rewthreads'of the said heed-'1" rand taiIJ- iec'esb'eing of difiere'nt pitches:

- end piece clempinjg' means "effthe charecter. described 5 c0mpr1eing: "a T screw those of; the tail-piece.-

vcombination with a n ophthalmic mounting includingiend pieees having difj-fl. ferent "sized ;aligned screw "threaded faper} 1 I tures formed therethrough of a screw heLv-q 45 111 an enlarged s crew threadedfhead'fend' a reduced-screw threaded tail ieee; the said threads of the tail-piece and ead-piecebe':

ing of difl'erent pltches said screwazbeing adapted to. be, weaved within the sfai to] WILLIAM BOU ELLEL y 

